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Monitoring diesel particulate matter and calculating diesel particulate densities using Grimm Model 1.109 real-time aerosol monitors in underground mines.

Authors
Kimbal-KC; Pahler-L; Larson-R; VanDerslice-J
Source
J Occup Environ Hyg 2012 Jun; 9(6):353-361
NIOSHTIC No.
20040929
Abstract
Currently, there is no Mine Safety and Health Administration (MSHA)-approved sampling method that provides real-time results for ambient concentrations of diesel particulates. This study investigated whether a commercially available aerosol spectrometer, the Grimm Portable Aerosol Spectrometer Model 1.109, could be used during underground mine operations to provide accurate real-time diesel particulate data relative to MSHA-approved cassette-based sampling methods. A subset was to estimate size-specific diesel particle densities to potentially improve the diesel particulate concentration estimates using the aerosol monitor. Concurrent sampling was conducted during underground metal mine operations using six duplicate diesel particulate cassettes, according to the MSHA-approved method, and two identical Grimm Model 1.109 instruments. Linear regression was used to develop adjustment factors relating the Grimm results to the average of the cassette results. Statistical models using the Grimm data produced predicted diesel particulate concentrations that highly correlated with the time-weighted average cassette results (R2 = 0.86, 0.88). Size-specific diesel particulate densities were not constant over the range of particle diameters observed. The variance of the calculated diesel particulate densities by particle diameter size supports the current understanding that diesel emissions are a mixture of particulate aerosols and a complex host of gases and vapors not limited to elemental and organic carbon. Finally, diesel particulate concentrations measured by the Grimm Model 1.109 can be adjusted to provide sufficiently accurate real-time air monitoring data for an underground mining environment.
Keywords
Mining-industry; Underground-mining; Underground-miners; Sampling-methods; Diesel-emissions; Diesel-exhausts; Particulate-sampling-methods; Particulates; Samplers; Aerosol-particles; Aerosol-sampling; Analytical-instruments; Monitors; Mathematical-models; Time-weighted-average-exposure; Statistical-analysis; Air-quality-monitoring; Author Keywords: cassette; diesel particulate matter; DPM; Grimm Model 1.109 aerosol monitor; underground metal mine
Contact
Leon F. Pahler, University of Utah, Rocky Mountain Center forOccupational and Environmental Health, 391 Chipeta Way, Suite C, Salt Lake City, UT 84108
CODEN
JOEHA2
Publication Date
20120601
Document Type
Journal Article
Email Address
leon.pahler@hsc.utah.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008414; B07092012
Issue of Publication
6
ISSN
1545-9624
Source Name
Journal of Occupational and Environmental Hygiene
State
UT
Performing Organization
University of Utah, Salt Lake City, Utah
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